All of these programs are extremly rare. The two San Francisco Clipper programs were from the old Pacific Coast Football League. The PCFL was a professional league on the West Coast before the NFL and the AAFC. While the NFL at the time was discriminitory and wouldn't allow black players on the teams, the PCFL welcomed black players with open arms. When the Rams moved the LA in '46 along with the Dons and the 49ers in San Francisco of the AAFC, black players were given more of a chance to play.

The 1934 San Jose State vs. the College of Pacific program is a great example of 1930's program art by the artist, Alonzo Keller (Lon Keller). SJS and Pacific were old West Coast rivals who started playing each other in the 1890's. Unfortunately, UoP dropped football after the 1995 season.

The 1952, 49er vs. the San Francisco Broncos is an example of a rare pre-pre season game between the 49ers and the semi-pro Broncos. The 49ers only played two semi-pro teams, the SF Broncos and the San Jose Packers. They would beat up on the semi-pro teams then they would go on to play regular NFL teams in the pre-season. 1952 was the last year they did this.